Asus released new versions of the A7V333 that use the updated VIA southbridge which has integrated USB 2.0 instead of tacking on a PCI-based USB 2.0. These new variants are A7V333-X boards and there is more than one type. It may or may not fix the issue I described with mine.
The Realtek CODEC is used on the A7N8X-Deluxe, but not as the audio processor... on that board, it just translates the digital signal from nVidia's audio processor into analog and connects it to the rear jacks. On the A7
V8X, I *think* it's used to do the audio processing as well. The nVidia APU is a tough act to follow in the processing department, so while analog audio output quality may end up the same due to the use of the same CODEC, the nVidia part is probably going to have more capabilities as far as the number of 3D voices it can handle, and how much CPU usage it requires to do it. And then there's the digital-out, which as I understand it, will bypass the CODEC altogether and deliver digital audio directly to compatible speaker systems.
For me, after looking through the pages of benchmarks starting
here, I concluded that the nForce2 boards are the way to go from a pure performance perspective, compared to KT333 or KT400. Look at the results and see what you think.